Handling Of Accessories - ABB AC500 V3 Hardware Manual

System assembly, construction and connection
AC500-eCo > Handling of accessories
Interface
2.5.4.2.2 Modbus RTU connection details
The Modbus RTU protocol is implemented in the AC500 processor modules.
Modbus is a master-slave (client-server) protocol. The client sends a request to the server(s)
and receives the response(s).
Available serial interfaces can work as Modbus interfaces simultaneously.
The Modbus client operating mode of an interface is set with the function block
COM_MOD_MAST.
Technical data Table 188: Description of the Modbus protocol
Parameter
Supported standard
Number of connection points
Protocol
Operating mode
Address
Data transmission control
Data transmission speed
Encoding
Max. cable length for RS-485 on serial inter-
face option board used on the CPU.
Bus topology Point-to-point with RS-232 or bus topology with RS-485. Modbus is a master-slave protocol.
For further information on Modbus see chapter .

2.5.5 Handling of accessories

This section only describes accessories that are frequently used for system assembly, connec-
tion and construction. A description of all additional accessories that can be used to supplement
AC500 system can be found in the Hardware PLC device description.
2.5.5.1 MC5102 - Micro memory card with micro memory card adapter
● Solid state flash memory storage
946
Pin
8
Shield
Value
See Serial interface
1 client
Max. 1 server with RS-232 interface
Max. 31 servers with RS-485
Modbus
Client/server
Server only
CRC16
From 9,600 bits/s to 115,200 bits/s
(see Serial interface)
1 start bit
8 data bits
1 or 2 stop bits
1 parity bit (see Serial interface)
1.200 m at 19.200 baud
3ADR010278, 3, en_US
Description
NC
Cable shield
Not connected
Functional earth
2022/01/31